Pure Bending Characteristic of Tilted Fiber Bragg Grating |
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Authors: | Bo Liu Yin-Ping Miao Hai-Bin Zhou Qi-Da Zhao |
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Affiliation: | Institute of Modern Optics, Nankai University, Tianjin, 300071, China |
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Abstract: | a novel structure of the pure macro-bending sensor based on the tilted fiber Bragg grating (TFBG) is proposed. The TFBG located in the half circle with the different diameters is bent at a constant angle with respect to the tilted grating planes. With the variations of the curvature, the core-mode resonance is unchanged and the transmission power of cladding modes detected by the photodiodes varies linearly with curvature, while the ghost mode changes by the form of two-order polynomial. So we can use the transmission power of ghost mode or other cladding modes to detect bending curvature as shape sensor. From a practical point of view, the sensor proposed here is simple, low cost and easy to implement. Moreover, it is possible to make a temperature-insensitive shape sensor due to the same temperature characteristic between the core mode and the cladding modes. |
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Keywords: | Half circle optical fiber sensing pure bending sensor tilted fiber Bragg grating |
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